The beautiful Sharon Stone is putting her time and energy where her heart is, raising money for an important children's charity.

"That is why we're all here. We care about our children, we care about our families, and we care about other people," Sharon told the crowed at the Elizabeth Glaser Pediatric AIDS Celebrity Golf Classic on Monday.

It was there that the stunning 47-year-old star broke baby news to "Extra," confirming she has adopted a third child.

Now, her other two kids, Roan, 6, and Laird, 16 months, have a baby brother named Quinn.

Sharon's new addition has something else in common with his big brothers. "All of my children have been adopted on the day of their birth," she revealed.

Like her passion for children, Sharon has never tried to hide her deep love for children's charities.

"For the last 11 years I've been working with the American Foundation for AIDS Research," Stone said. "We now know that over 1,800 children are born everyday HIV positive. And 50 percent of those won't live to be two years old."

That startling fact helped bring out a who's who of Hollywood on Monday afternoon, including Ray Romano, James Caan, Sylvester Stallone and Billy Crystal, who couldn't wait to see Sharon go from golfer to event auctioneer.

"I may bid on her," Crystal joked.

It's true: that night Sharon traded in her golf clubs for a microphone, hosting an auction that raised nearly $600,000. The superstar even sold the dress of her back for $5,000.

"I'll take if off, and you can wear it home," she told the generous bidder. "Take it with you tonight."